Inventories (Summary Of Inventories) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Raw materials	$ 487	$ 497
Work in process	344	371
Finished goods	1,470	1,468
Supplies and other	321	300
Gross inventories	2,622	2,636
Excess of FIFO or weighted-average cost over LIFO cost	(249)	(280)
Total	2,373	2,356
LIFO [Member]
Raw materials	153	163
Work in process	204	245
Finished goods	667	708
Supplies and other	0	0
Gross inventories	1,024	1,116
Excess of FIFO or weighted-average cost over LIFO cost	(249)	(280)
Total	775	836
Non-LIFO [Member]
Raw materials	334	334
Work in process	140	126
Finished goods	803	760
Supplies and other	321	300
Gross inventories	1,598	1,520
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,598	$ 1,520